Top system for towing and working. Optimizes airflow, air density, continuous power, durability and MPG. Adds up to +100 hp and +235 lb-ft (rear wheel). The ultimate engineered power system for working and towing applications, PowerPack has Banks' full gamut of intake, turbo, exhaust, fuel tuning and intercooling upgrades for Cummins. PowerPack delivers mighty best gains up to +100 hp and +235 lb-ft (rear wheel) of safe tow-all-day power with optimum engine efficiency and durability, adjust-on-the-fly power, lower exhaust gas temperatures and virtually no backpressure. And with the EconoMind's fuel economy features, more driving between fill-ups, too! Split-dual exhaust applies to single-rear wheel applications only (they do not fit appropriately on duallys). Cummins 325/600 trucks: Banks turbine outlet pipe and BigHead wastegate actuator not required on these systems. Products listed below for 2003-04 model years apply to 235, 250 and 305-hp rated engines. Cummins Engine Horsepower Rating is found on the engine identification tag, located on the side of the timing cover of the engine near the injector pump.